Classless Inter-Domain Routing (CIDR / ˈ s aɪ d ər, ˈ s ɪ-/) is a method for allocating IP addresses for IP routing. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous classful network addressing architecture on the Internet.

CIDR notation represents an IP address and a suffix that indicates network identifier bits in a specified format. For example, you could express 192.168.1.0 with a 22-bit network identifier as 192.168.1.0/22.

Nov 7, 2023 · CIDR, or Classless Inter-Domain Routing, is a networking technique introduced to overcome the limitations of the traditional IP addressing system, which was based on classes. CIDR allows more flexible allocation of IP addresses by eliminating the …

Interactive tool for IP and CIDR calculations. Visualize subnet analysis and IP ranges. Educational resource for network planning and IT learning.

CIDR (Classless Inter-Domain Routing or supernetting) is a method of assigning IP addresses that improves the efficiency of address distribution and replaces the previous system based on Class A, Class B and Class C networks.

Classless inter-domain routing (CIDR) is a set of Internet Protocol (IP) standards that is used to create unique identifiers for networks and individual devices. The IP addresses allow particular information packets to be sent to specific computers.

Aug 5, 2019 · Classless inter-domain routing: Why was the CIDR format introduced and how does it actually work? We explain the principle of CIDR using examples

Jul 28, 2010 · CIDR (Classless Inter-Domain Routing, pronounced "kidder" or "cider" - add your own local variant to the comments!) is a system of defining the network part of an IP address (usually people think of this as a subnet mask).

Apr 7, 2025 · What is CIDR? CIDR is a system for allocating IP addresses and managing IP routing. It stands as a departure from the traditional classful IP addressing system, which divided the IP address space into fixed blocks based on classes (A, B, and C).

CIDR (Classless Inter-Domain Routing) allows efficient IP address allocation and routing. This tool supports the calculation of network addresses, subnet masks, and host ranges, and is user-friendly. Free online tool for calculating CIDR for IPv4 and IPv6.